Cleaned the timeline code up nicely.

include/dawn/display/animation/timeline.h

@@ -8,6 +8,8 @@
 #pragma once
 #include "../../libs.h"
 
+#define TIMELINE_ACTION_COUNT_MAX 128
+
 /** Type forwarder for timeline_t */
 typedef struct _timeline_t timeline_t;
 
@@ -50,6 +52,6 @@ typedef struct _timeline_t {
   void *user;
 
   /** Actions within the timeline */
-  timelineaction_t actions[128];
+  timelineaction_t actions[TIMELINE_ACTION_COUNT_MAX];
   uint8_t actionCount;
 } timeline_t;